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Major manufacturers such as Altria Group Inc., Richmond, Va., and Reynolds American Inc., Winston-Salem, N.C., have invested time and money into stamping out illicit trade (despite the fact that, technically, cigarette manufacturers do not actually lose money when cigarettes are bought in one state and smuggled into another)

Its one of the pricier models on this list, both for the base machine and for its replacement filters ($70 a pop, compared to the $20-to-$50 range of other models here), which you can expect to change out every six or so months

Journal of Economic Literature

Look for air purifiers with True HEPA filters and activated carbon filters to efficiently remove particulate matter and other foul-smelling constituents of cigarette smoke